In Robotica Farms there will be flying Robot Bees, and there will be small balls near them you can pick up and spit at them to kill them. You'll have to do that to each bee in the level.
Here are the locations
1. Ball and Bee are directly in front of you at the start of the level.
2. Using the starting ball, the next bee is to the right before the bridge and windmill
3. The next bee is ahead at the Sea-Saw platforms, there is a ball dispenser directly behind the bee
4 & 5 There are two more bees at the top of the Sea-Saw platforms and a ball dispenser to the left of the windmill behind them
6. Use the same dispenser and the next bee is directly past the 2 windmills, to the right.
7. Using the same dispenser again, the next bee is to the right of the elevator.
8 & 9 The next dispenser is just ahead near the first Sea-Saw platform, and the final two Bees are just down the path near the windmill.
I used the balls on him only the flying enemies, and barrels in the standings barrel pushers. I'm not sure if those are relevant.